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Throttle trim on 650 and 850

Old 01-04-2016, 02:14 PM
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Default Throttle trim on 650 and 850

I have been flying with a 650 for while and got an 850 for Christmas.
I have a need to adjust the throttle using the trim but the 650 doesn't let me use the throttle trim above 50%. The 850 seems to be OK and I can use the trim at any throttle setting. Is there a way to have the 650 use the throttle trim above 50%??

Ivor
Old 01-05-2016, 07:29 AM
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According to the manual for both transmitters, throttle trim is not operative when the throttle stick is above 50%, though the indicator on the face will show movement. Your transmitter is acting normally.
Old 01-05-2016, 11:02 AM
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I hate to disagree but my 850 throttle trim does work above 50%. I have a PWM pulse width indicator which I use to check servo travel versus transmitter signal.
For the 650 I get no increase of the pulse width as I use throttle trim above 50%, just like the manual. For the 850, with the trim at neutral, I get 1000 microseconds pulse width with the throttle at idle. At full throttle I get 2000 microseconds. About normal for most transmitters.
At full throttle when I push the throttle trim to the increase direction, the pulse width increases to 2150, and with full down trim the pulse width deceases to 1850. So there is a 150 microseconds trim available in up and down direction with the throttle at full up. Please don't change this, I can use the trim on multi-motor planes. It would be nice to get it on the 650 if a software update could do this.

Ivor

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